Flqurietg-mill



S. WOLFF.

Balancing Millstones.

No- 20,972.- I Patemed Ju|y 20,- 1858.

martian sraras retreat oriarn.

S. IVOLFF, OF VIOKSBURG, MISSISSIPPI.

FLOURING-MILL.

Specification of Letters Patent No. 20,972, dated July 20, 1858'.

T 0 all whom it may concern."

Be it known that I, SAMSON \VoLFr, of Vicksburg, in the county of lVarren and State of Mississippi, have invented a new and useful Improvement in FlouringMills; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specification, in which the drawing shows a perspective view of a mill constructed with my improvements.

Similar letters of reference indicate corre sponding parts.

The object of my invention is to overcome the disadvantages experienced in the running of flouring mills, from the use of screw rods and springs for adjusting and easing the action of the running stone, accordingly as the character of the wheat shall demand, to insure a perfect and successful grinding of the same.

The nature of my invention consists in increasing or decreasing the effective grinding action or friction of the stones, without the necessity of changing the distance between the grinding surfaces, by having the spindle of the running stone arranged between an unyielding, but adjustable stop, and a pivoted weighted yielding lever, in the particular manner hereinafter specified. By arranging the spindle of the running stone so that its lower end bears against an unyielding bearing, and its upper end is held down by a lever which is weighted, said stone can be caused to grind the grain with any necessary increased friction or force, or any surplus friction or force can be removed without decreasing or increasing the space existing between the grinding surfaces; said arrangement allowing of these results being accomplished in such a manner that although the upper stone is heavily weighted, its action or pressure can always be counteracted by any superior resistance of the grain or other object between the stones, as in the event of clogging of the grain from too great moisture or ununiform distribu tion of feed and imperfect delivery at the periphery of the stones; and. consequently the flour will be kept and discharged in a cool state, and the miller also enabled to ad just his stones to suit the amount of water or steam power he has. Whereas when a screw is used for adjusting the running stones the weight is not yielding and therefore the only objects to be attained are grinding firmer or coarser. And when a spiral spring and set screw are used the spring is necessarily compressed to sucha state in order to accomplish the object aimed at that the weight may also be said to be a dead unyielding weight, and therefore the object secured but little, if any, better than that obtained by adjusting with the screw rods simply.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A, represents the frame of the mill. B, B, the upper and lower stones. The lower stone B, is stationary or may run with the upper one B, if desirable. The upper stone B, is hung on a spindle C, which has its bearing in a step D, and cross head E. The step D, is capable of being raised or lowered in grooves a, a; and its adjustment is accomplished by means of two levers If, F, which are attached to it, and pivoted to the frame as shown at b, 0. On the outer end of each of the levers a weight G, is at-- tached whenever it is necessary to lessen the weight of the running stone. The upper end of the spindle C, extends up through the cross head of the frame, and a lever I, rests upon it, said lever being pivoted by one of its ends to the top of the cross head at a, and provided with an adjustable weight J, at its other end. The weight J, by being moved out farther on the lever from the spindle increases the weight of the stone by means of the great length of leverage secured. The effect is the reverse when the weight is moved in toward the spindle.

It will be observed that no matter how great the length of leverage given to the weight the stones will not be brought nearer together but will simply be caused to grind with an increased power and thus while this desideratum is secured, choking, &c., are completely avoided.

It should be here stated that when the running stone is too heavy the upper weight is not to be employed in connection with the lower weight, and also that when the running stone is too light the lower weights are not to be employed in connection with the upper one.

What I claim as my invention and desire justable step D, and a pivoted Weighted to secure by Letters Patent, is

yielding lever I, J in the particular manner Increasing or decreasing the effective specified, for the purpose set forth. grinding action or friction of the stones 5 B, B Without the necessity of changing the distance between the grinding surfaces, by having the spindle C, of the running stone B, arranged between an unyielding, but ad- SAMSON WOLFF.

Witnesses Gr. YORKE ATLEE,

WVM. YORKE ATLEE. 

